The eight skills we released in September, run on Claude Sonnet and Haiku with the file and without it. Five clearly helped, two changed nothing, one hurt.
Five of the eight helped clearly, two made no difference we could measure, and one made the weaker model worse. These are the skills we put in our catalog in the last two days of September 2026. For each one we ran the same cases twice on two Claude models, Sonnet and Haiku: once with the skill's SKILL.md loaded and once without it, the same request and the same checks on both sides. This page is about our skills and is written by the people who sell them, which is why the losses are listed next to the wins.
Read the full report on AISkills402: https://aiskills402.com/blog/our-skills-september-2026
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